Sennheiser RS 120-W Instruction Manual page 23

Specifications
Power supply unit – model: NT 9-3AW
Nominal input voltage/cur-
rent
Power frequency
Nominal output voltage
Nominal output current
Temperature range
Relative humidity
100–240 V~/100 mA
50–60 Hz
9 V
300 mA
operation: 0 °C to +40 °C
storage: –40 °C to +85 °C
operation: 0 to 90 %, non condensing
storage: 0 to 90 %
RS 120-W | 23